| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
|
|
#1
08-28-2025, 06:17 PM
|
||||
|
||||
Did you use a two part flush?
That type is the best, but you should by pass the heater core for the flush. Is there a fan clutch and does it keep the fan engaged at engine idle speed when the motor is up to temp, Does one of the exh manifolds still have its heat riser flap and if so is it jammed closed? Is the exh system bent up and restricted? If the vacuum advance is not working that can contribute to low speed hot running. You might just right off the bat pull the water pump to make sure the two seal incerts are there in the divider plate and are in good shape and also to check the water pump impeller to divider plate clearance. Also just to look at if the pump has the preferred good cast iron impeller or if it’s crappy type that looks like an Alternator fan .
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 08-28-2025 at 06:25 PM. |
|
#2
08-29-2025, 08:11 AM
|
||||
|
||||
|
The motor was rebuilt before I got the car. It has a 455 with Kre dpors on it.
__________________
 A new best of 9.135 @ 145.4171 Lemans Sport. 72 Lemans Sport. RIP 75 Grandville Convertible. |
|
#3
09-02-2025, 04:55 PM
|
||||
|
||||
|
So If I can stop the fan at idle wouldn't you think the fan clutch is bad?
__________________
A new best of 9.135 @ 145.4171 Lemans Sport. 72 Lemans Sport. RIP 75 Grandville Convertible. |
| Reply |
| Thread Tools | |
| Display Modes | |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Hybrid Mode
